Hydraulic jack



FIG. 1 is a front perspective view of the hydraulic jack showing my new design;

FIG. 2 is a back perspective view thereof;

FIG. 3 is an enlarged front perspective view thereof with the handle removed for convenience of illustration; and

FIG. 4 is a back perspective view of FIG. 3. 

The ornamental design for a hydraulic jack, substantially as shown. 